Chara fragillis. A common form of chara.. There are many varieties of this species and all are classed very high as food producers and oxygenators. Grows profusely in all limestone waters throughout the United States.
Potamogeton americanus. 1, seed; 2, seedling 5 days old; 3, seedling 14 days old; 4, seedling of four months; A, winter buds; 5, germinating winter bud, natural size; the last two winter buds belated in development. Aquarium specimen, January 24, 1914